Roll Flutter from d554fcb36a6e to 98c04987963b (18 revisions) (#2682)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 7dd277e..63c2d50 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-d554fcb36a6e6a6a83d0c7759d2a4cd113701aef
+98c04987963b6d36b107648161878cd1cfa1cdc2